package com.angcyo.uiview.less.widget.pager;

/**
 * Copyright (C) 2015 Kaelaela
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

import androidx.viewpager.widget.ViewPager;
import android.view.View;

public class DefaultVerticalTransformer implements ViewPager.PageTransformer {

    @Override
    public void transformPage(View view, float position) {
//        float alpha = 0;
//        if (0 <= position && position <= 1) {
//            alpha = 1 - position;
//        } else if (-1 < position && position < 0) {
//            alpha = position + 1;
//        }
//        view.setAlpha(alpha);
//        view.setTranslationX(view.getWidth() * -position);
//        float yPosition = position * view.getHeight();
//        view.setTranslationY(yPosition);

        if (position < -1) {
            view.setAlpha(0);
        } else if (position <= 1) {
            view.setAlpha(1);
            view.setTranslationX(view.getWidth() * -position);
            float yPosition = position * view.getHeight();
            view.setTranslationY(yPosition);
        } else {
            view.setAlpha(0);
        }
    }
}
